S-91772A743 4-48 x 1/2" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
• Precise thread engagement with Class 2A UNF fine threads ensuring secure, vibration-resistant fastening
• Optimized drive efficiency featuring Phillips No. 1 drive for controlled torque application and reduced cam-out risk
• Maximum grip length through fully threaded design providing consistent clamping force across the entire 1/2" length
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards (RoHS 3 & REACH)
• Versatile pan head design with rounded profile offering low-profile installation and improved aesthetic finish

Professional Applications & Engineering Value

This 4-48 UNF pan head Phillips machine screw delivers critical performance advantages for precision assembly applications. The passivated 18-8 stainless steel provides excellent corrosion resistance, eliminating premature failure in humid or chemically aggressive environments. The UNF fine thread configuration with Class 2A fit ensures superior vibration resistance and precise torque control, making it ideal for electronic enclosures, instrumentation, and machinery where loosening under dynamic loads is a concern. The combination of 70,000 psi tensile strength and fully threaded design guarantees uniform stress distribution, preventing joint failure in high-stress applications. These engineering features make it particularly valuable for aerospace, medical device manufacturing, and precision equipment assembly where reliability and regulatory compliance are paramount.

Specification Summary & Compliance

This machine screw maintains precision Class 2A thread fit with 4-48 UNF fine threading and complies with ASME B18.6.3 manufacturing specifications. The product meets stringent environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance, ensuring safe use across global markets. Dimensional accuracy is guaranteed with standardized 1/2" length, 0.219" head diameter, and Phillips No. 1 drive configuration for consistent performance in industrial fastening applications.